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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765525ee2971909cd78127e199e170684b22fd4a4857f82a97ddd48cfe8f3cfb' 
  AND token = 'yKnG2fpt6H6jtrptety7oHun4jZOsrYYw2wRjuJsh/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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