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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cbb3e2d74ab0ed1d81ee186f9a16c822cf6b1ef3846f64b0e7b0961c3e4952' 
  AND token = 'DcVeNX7utQFqYHNzEusygN1s/G80rXVdN0rroC7lDlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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