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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac8b4eb6943e261ff6fc582d80c99e27bd29ef51c35129cff2695035b930e19' 
  AND token = 'Dt1c/EYVGGtfgk54V7nrlm03rKYxWA25NkI1K70m+3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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