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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157b411e7fce6c5bd27b9a157157d3802fd5e456640c66ba1dcf9103613ec34b' 
  AND token = 'gcTGGbvFFK0ewGQQQQ2t3Pb2DX8KeebvpbM5uSCYlao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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