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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12aa23f6a97d045823deee3311fcbdfab87a9b00ea4e5c6e09306651c09f929' 
  AND token = 'dcWv6tN5U0J19t1e3zkTsgB/eAoS1KKWCjbUk2gOa20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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