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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa91d3d018f126661b861e0c6f642808438e27a71434458f3f3d9d72976d572' 
  AND token = 'ivlta2pjv/O3ktqFcEkHV5/cyd4y3hy1sqwMAdLOwVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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