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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5bf3b5efd277dfafc769c4037cc536ce40e5651a936af7ac8dee58d5cfe2dd' 
  AND token = 'nXmOGTLj/uPtfCS+2H+g+wrTiol/o43HxIrB019/f7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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