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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7eaf6eb3428166e7d4fae546f10b8e75807403563ec5b3f17200c99a8fb8624' 
  AND token = 'm3sB9lcQ2owA3otwhIgavX+Ve56LncMLgD8tSBMVMio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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