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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776ca9b4d898effad10181b90d0c2cad1103082dc14c76795e1ba791914e8c37' 
  AND token = 'TS7J7pL2VcjIvlUne+AG9/KyE7OhV747LG9/9oVqwTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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