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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e87dda5de243619274c8876f687e6d3d5ddaeada07925cb93721901b05947c' 
  AND token = 'VChIfsOe03XOKtcvUu3hRQ61A8lwEn6EGd734aY2O2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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