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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3409b1cb620741a835896db054edee7f6ee6b9c957469b53e90fd2f1338b3efe' 
  AND token = 'bcWvRTBLHtZCJWRvflHhH11q6eaObA0az2n/SvdZLPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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