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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b890cfcc31a8fab62d0383fd5fbc30f55b6b5bdca04f84380647d0d998c13735' 
  AND token = 'QDpU+AWVpynBCZVmzAdKVETYY97SO7NPbvF3sTNz7Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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