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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c058dcd6d728f0abae8483793f8745fe40f09b8524f42cc08c89123945a2adf' 
  AND token = 'feqWBZRSCMDaIBi3rlfsc1y4UvS2EQALAG+eCTFEjNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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