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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5267d5d9582edff7e1c406ba9e0d25e2d8723c9daebbf14361f38eb72b5fc97' 
  AND token = 'B2AGR1gQqIY/DQsbke1U3zYsavYdF8feyadv63QvVgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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