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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c9f6bc01afb54b1019c01f7324ea93222f01f4f8990445a96e0d915ad028f4' 
  AND token = '/1I1SIzWa/4sjfd9T1RommwNzPXSqNBsDd39yxrKQrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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