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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d0f818d2fab086a723bcfc149ed03b06f01b955fc57279190199142d52f44f' 
  AND token = '4DGWXGyrw7Ep2zpOI0rHaJ3cVQfujDsv52U7ilBNGK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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