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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d93f4a53b366acb772fc5cde0cbf6915a868c8b2246d22a34822ff3a1ae7ce2' 
  AND token = 'eyEYToM0Beeuz3vevpJY9TEpXSQap0okxkvdUuF014s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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