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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24be42d32fbff01cce9dd7350915bd3eb9295b4ff27e19284ba38a21b1abeea8' 
  AND token = 'I6XDF1qk0r0xvLg0SbYS2RhlreHZ3bab4k8ahxsEueQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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