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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc4c5af0a632976d54f7d5e6ff4a94fc5b94949cd4ce5610477d52fa1b1f990' 
  AND token = 'GElPmm6tNxN1CcN94OLm2Ttafzb4bWvvRQrdlPL1Lrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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