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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5632f5114e06866360e7a7844d9cb0e18f4bc12ce92be98a1b72ddfd46f11c6' 
  AND token = 'aDhDMvC+5IW0xSAWAOkBl5j6bvoU1Rx6/Lo1qbHrt7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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