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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3972f1e88b773035a38590cfd9ca49cf2c8684dd4812296f86f81fbcca4d7fb0' 
  AND token = '7LNEIeo8I/iKxt/0JE4f0orYfunEN2uQ9rvcphEhH7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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