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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbea455cc61c88ef4e68bcf6dc946a2c0b63e744a68c2b184f36676e8ac0250f' 
  AND token = 'D2xgCgNdeZ1dkI/YjE0614LXQ8p4CbeTwYzoFJT8p7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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