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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1206aad15f0bcdab6b900b2c3d6e20c33d2e5dc276c6fb74c1e4affbd41d6acc' 
  AND token = 'Lf/SKitdDacMV6XbaxBLDCg6AY//B7CX9IDOqIJxn7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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