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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fa051211513acb48e08db5373c4e2beb143ac8507c73411c762cecc7d2bee6' 
  AND token = '29+uTtpKDjZvwGXGOlLZum/mdOFwG1OYId158M+FyAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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