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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0804246b239187c612547bbb8763618a90bbcd3144e95e2d1f156da4027cc7' 
  AND token = 'SzjxPWxQRnfZYmZUpbA41x5A1Rv9yUwTTjQi9/7KCE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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