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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4440df494a3c2f008487b3f2e862e4e212881f98b4a2b0cb1fc18dba87f0a601' 
  AND token = '5Q24dS2y/uCvJ5I7XvdNalfXuYNkE/J7tjt4loB7s6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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