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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfe3966e96cee95515b650d87d6290aa43f3d01828c81534fd2c810d6aa5059' 
  AND token = 'jSyd5mLSVOu73B5BXQzbZjsQv3jFiyu9W5pL3gi1NFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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