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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b54391bf5b9eb187c08eae5b6ca550e78ab3fdc40f388224500a7d3941eb40' 
  AND token = 'on08q+kUDUrozkJdhsLu5KMl7591UtosJyuhpJ5J+LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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