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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce6f27988c3130ca535f95576e1ce462ee2b39c03700449927f990c47ce0793' 
  AND token = '3nm5qk57h2tjNY0blMtHl/FT2ad+GIefJPqY5bJ2KHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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