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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752a5e75f0bffe7bb2e03a1ea3edf8bc44fb101f13dc5fe8fa5c97ab1f0f8c27' 
  AND token = 'lwBEOlVqQPJbDjTLQUsahizALe9FVgCvl5e2Bhc5KaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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