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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abf18e6b2c3091c77bfe3d54f9c9926b50321ca1204e6ad00acf2dc8cc92ae4' 
  AND token = 'MYDsk6Cxx1i9o2S2g9rjudZVR0es/O5SktkiIuLYQPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}