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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '527c2b2a661dc1b92dc6d9343ea830809dfcc0b532db37ffa5e527d22d8a3eef' 
  AND token = 'IY8wFJnvzSsDv9W9yAflLyvtdlPChankVLZPe7dJeyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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