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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abb566dd5cce9dacef4489f2dad27674bcd568d9bcd79725bfb89e6f1b0c35e' 
  AND token = 'A1+ZHdMkQsTziqQebjpwW+mRRa4y+HsFYvstwRn0gD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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