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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a31a5690266cf769349cec22b5b04f13dc4f0dae037ed84fdb4e9bcc27f94a' 
  AND token = '7kUNylsDJAztmqhBKuA67rlsiAd8x4qKuS+JMpw3ewQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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