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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028e8144231b530d6bf18c5a9c278177e5a6df6e458bd7c8fc7346e972a893a0' 
  AND token = 'xR/N2pYCcpy/cQrx+ZoiSRgcPAxXWryCgOVTTpsmGZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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