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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6effb580af71f2f96413cf7c0b96be3e22a51ea4fab382d7cc455482dbab4942' 
  AND token = 'eyuzIAro7yWP63/ky58o5c6x3IxYUez+B8cgjQG46TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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