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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10116e25bc6f5b8450421e86263eac4d00f70430643aa585b008c63fb15c57cc' 
  AND token = 'M0l1nu6LeincEUHexY41G2Twah0EAgOmy6xonLy/dAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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