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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929b1fa01bf3f4d76db08811ee3bd07856411e22d48fa51b083f7caee774d07f' 
  AND token = '70gRrF7HzbD7BUDb7u4e2507WgKxf4pwATjjjXPMKfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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