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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf969083ce0d406e82910894f60e3c511001b28a0cdf2818d819d634913ef437' 
  AND token = '8SN4r34EKj0YGFdVXnFDmW7xqB98ZQ8p1fP/dA2IZRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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