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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4316fac518f501067efaa8c2f825c86e64dc01baa4d2dee342ff6b67625255' 
  AND token = 'THElFB2XO5m9lPnWxdlsedvUyyOqkS+IgqSWmpjIqAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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