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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7079e06b2d1e9d9eb31196b4e273b54ab419d3fab4dadb2467db54497fb70a9b' 
  AND token = 'a6j4A2P1/J8ssP7D0149VKkvZa95Tq3THUHen5cD54I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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