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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fcff69dbc4e69a9d64bd7755e24439f14ded76d4a34c2f301438fce8edf6cd1' 
  AND token = '8JtNfti80yo7C5x32KtwusXGbi+xQ1JYX/nWhHGhmc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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