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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a558d7cce2db1ac5980e0963d45d645e5de22d3f5b9e7cfd7dcd94303d2f64dc' 
  AND token = '+T5ZpYWPaAV/Cg2S9NPH658L9H9v8emlwmtWfSepePg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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