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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e51f2552de4d849cb41d57ac1b630ff0dd841676bf91e2b24bc0557e05aea088' 
  AND token = 'GCoTWTQI5s7Cmxg8PZs6qGYHUVCEAEvIqXAiss6Rsl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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