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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6506a0a0e9f45ede64431c676f5f81d06ee9d925ef464f11e8a85598b44845e' 
  AND token = '9d189Nd4yWP6WOqJkDznoTbs10wm9KtwskjD+AUU7VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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