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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2853f403556f50bcdc9d2fbfd62bc90f966a6e5da8b29fa8b1dd5f58ba684a3' 
  AND token = '5Mt+8aFwnSVKu0l0p5aIttWH2EpNxn30CzMvQYt/PRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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