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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d3ae6ed975d34fe0b8eb4aa72e44b761e896ff39cc48b0e1ef948a91d3138d' 
  AND token = 'nsKkusBv4UDppqDZXeZE4EmCpaT7Tti+hLiAFAKP8e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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