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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2841193da2bbfa6c0f5d5306a027c5a780ae14b784f38ee8058fbaff729ba88c' 
  AND token = 'm1PwM5D6uuMRr/Hqvrd6mPMoSPfngiH/aPzLyqwm2g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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