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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272297bc74d85782132b89fa2bbd6cec51160b738a04d6ddfb000499f7d29aed' 
  AND token = 'Hin2fu6xNBdIowpn9zvxKlw5Nk8+UxQgRGf7OmedcR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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