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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b710f4eee245bd0ce4a35326824c62afcbd1dd9c6743547a1d174b2646e7833f' 
  AND token = 'xW7G3QxL0Z87by+4djx34Z8s92pzfIZfdLX7Bu5KAnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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