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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1badf7028eafbb575078fd54f52081ace8644e9b546d893c40fde3813d2c6b' 
  AND token = '7g5e/QjEbPiAmBQ5uJnp1Z+4xQK5htOqAeOx1VcCbi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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