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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0947b59ac0f1e6f7f34b864b2b8c1fc874611f2afe1b0bd6edacf8b347d3a0b8' 
  AND token = 'MmB/7W4E4kFcf5g3Ry1ziabj8hDvCciR6vITJShI6WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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