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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4420f70438ad746eceba8d510fb9bec32e3a822efafa90948163ed10620cece3' 
  AND token = 'JczPIXJhBJ++xaplMYVSQkSPe1hbJiBp73l6NMzh6Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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